Add system test for filter_record_transformer

Signed-off-by: Kenji Okimoto <okimoto@clear-code.com>

test/system/fluentd/setting/filter_record_transformer_test.rb

@@ -0,0 +1,30 @@
+require "application_system_test_case"
+
+class FilterRecordTransformerTest < ApplicationSystemTestCase
+  setup do
+    login_with(FactoryBot.build(:user))
+    @daemon = stub_daemon
+  end
+
+  test "show form" do
+    visit(daemon_setting_filter_record_transformer_path)
+    assert do
+      page.has_css?("textarea[name=\"setting[record]\"]")
+    end
+  end
+
+  test "update config" do
+    value = "key value"
+    assert do
+      !@daemon.agent.config.include?(value)
+    end
+    visit(daemon_setting_filter_record_transformer_path)
+    within("form") do
+      fill_in("Record", with: value)
+    end
+    click_button(I18n.t("fluentd.common.finish"))
+    assert do
+      @daemon.agent.config.include?(value)
+    end
+  end
+end